Viscous-Fluid-Enclosing Damper and Vibration-Damping Composition
a technology of viscous fluid and composition, applied in the field of vibration, can solve the problems of unstable vibration-damping properties of composition and insufficient dispersion of viscous liquid, and achieve the effect of increasing the demand for stability of vibration-damping properties and high specific gravity
Inactive Publication Date: 2013-12-05
POLYMATECH CO LTD
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Benefits of technology
The patent text describes a problem with a viscous fluid that contains inorganic particles to damp vibrations. The problem is that the particles have a high specific gravity and are not evenly dispersed in the fluid. This results in unstable vibration-damping properties. The technical effect of the patent is to address this problem and provide a more stable and effective viscous vibration-damping composition.
Problems solved by technology
Accordingly, their dispersion in the viscous liquid is insufficient.
Thus, the particles precipitate in the vibration-damping composition, so that the vibration-damping properties of the composition are unstable.
Method used
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[0039]A viscous-fluid-enclosing damper was manufactured, including a closed container (18) with a diameter of 15 mm and a height of 10 mm as illustrated in the FIG. 1. A polypropylene resin was used for a peripheral wall section (13) and a cover (16). A styrene-ethylene.butylene-styrene block copolymer (hereinafter, abbreviated as “SEBS”) was used for a flexible membrane section (14) and an agitating barrel section (15). In addition, a vibration-damping composition in which the following viscous liquid and solid particles had been mixed was used as a viscous fluid (12) enclosed in the closed container (18). Afterwards, viscous-fluid-enclosing dampers having different vibration-damping compositions were prepared as Samples 1 to 8.
[0040]In Sample 1, 100 parts by weight of silicone oil, whose viscosity at 25° C. was about 20000 mPa·s and specific gravity was 0.974, as a viscous liquid and 60 parts by weight of high-density, high-molecular-weight polyethylene particles, whose average mo...
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Abstract
Provided is a viscous-fluid-enclosing damper which attenuates, by using viscous resistance of a vibration-damping composition, vibrations transmitted between a support and an object to be supported, the support and object being attached to a closed container enclosing the vibration-damping composition of a viscous fluid. The viscous-fluid-enclosing damper alters few vibration-damping properties even when used under high temperatures and / or conditions where the vibrations are repeatedly generated for a prolonged period. Also provided is the vibration-damping composition which is used for the viscous-fluid-enclosing damper. The viscous fluid contains a viscous liquid having dispersed therein at least one type of heat-resistant resin particles and a dripping inhibitor, the particles being selected from polyethylene and nylon having an average molecular weight of from 50×104 to 600×104 and an average particle size of from 10 μm to 200 μm and preferably from 10 μm to 160 μm.
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to vibration-damping technologies used for on-board and / or consumer-use audio equipment, video equipment, information-processing equipment, various precision equipment, and household electrical appliances such as a refrigerator. The present invention relates more specifically to a viscous-fluid-enclosing damper which can attenuate vibrations transmitted between a support and an object to be supported and to a vibration-damping composition which can be enclosed in the viscous-fluid-enclosing damper and can attenuate the transmitted vibrations by using the viscous resistance of a fluid having the composition.[0003]2. Description of the Related Art[0004]While rotating a disk at a high speed, a disk drive plays back recorded data from the disk by using non-contact reading means such as an optical pickup or a magnetic head. At that time, operation of the disk and / or non-contact reading means may...
Claims
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IPC IPC(8): F16F13/08
CPCF16F13/08F16F13/10
Inventor OHKI, JUNJINAITO, AKIRA
Owner POLYMATECH CO LTD